Meth's devastating effects: before and after

(CBSNEWS) -- Methamphetamine is an illegal drug that acts as a central nervous system stimulant. Not only is the drug highly addictive, people quickly build a tolerance to it, leading them to use more and more of the substance.

Rehabs.com, a nationwide directory of rehabilitation centers, compiled mug shots of methamphetamine addicts to show the progression of drug abuse on their looks over a relatively short period of time. Keep clicking to see the devastating effects. (Photos Credit: Rehabs.com)